Visual oral toothbrush based on multi-dimensional detection and application method

Abstract

The invention relates to the technical field of oral application instruments, and provides a multi-dimensional detection-based visual oral toothbrush and an application method.The multi-dimensional detection-based visual oral toothbrush comprises a brush handle and a brush head, the brush head is detachably arranged on the brush handle, and a tooth brushing module, a tooth surface detection module and a tooth shape detection module are arranged on the brush head; a control module and an analysis module are arranged on the brush handle, the control module selectively controls the operation of the tooth surface detection module and the tooth shape detection module, and the analysis module is in communication connection with the tooth surface detection module and the tooth shape detection module. And the control module adjusts the detection surface of the tooth surface detection module according to the tooth form information fed back by the tooth form detection module, so that the detection surface is matched with the tooth form information fed back by the tooth form detection module. By means of the technical scheme, the problems that in the prior art, a toothbrush is single in function, and it is difficult for a user to conduct rapid, simple and convenient detection on teeth are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of oral application instruments, and in particular to a visualized oral toothbrush based on multi-dimensional detection and an application method thereof. Background Art

[0002] A toothbrush is a cleaning product, a handle-type brush that is used to add toothpaste to the brush and then repeatedly brush various parts of the teeth to maintain oral hygiene. With the rapid development of science and technology and medicine, people's living standards have been greatly improved, and the awareness of preventive health care has been continuously improved. Toothbrushes are not only used as a daily cleaning tool, but also gradually keep pace with the times and become a powerful assistant for oral examinations.

[0003] In the prior art, toothbrushes are used to remove plaque from tooth surfaces and maintain oral hygiene. However, from the user's perspective, it is far from enough to just clean teeth with a toothbrush. Instruments are also needed to inspect and evaluate the teeth, and then develop the best oral care plan for the teeth, and even predict and plan future dental care in advance. Therefore, there is a need for a toothbrush that can assist users in performing more simple and forward-looking inspections of their teeth. Summary of the invention

[0004] The present invention provides a visualized oral toothbrush based on multi-dimensional detection, which solves the problem that the toothbrush in the prior art has a single function and is difficult to satisfy the user's need for quick and easy detection of teeth.

[0005] The technical solution of the present invention is as follows:

[0006] A visualized oral toothbrush based on multi-dimensional detection, the oral toothbrush comprising a brush handle and a brush head, the brush head being detachably arranged on the brush handle, the brush head being provided with a toothbrushing module, a tooth surface detection module and a tooth shape detection module, the brush handle being provided with a control module and an analysis module, wherein the control module selectively controls the operation of the tooth surface detection module and the tooth shape detection module, the analysis module is communicatively connected with the tooth surface detection module and the tooth shape detection module, and the control module adjusts the detection surface of the tooth surface detection module according to the tooth shape information fed back by the tooth shape detection module so as to match the tooth shape information fed back by the tooth shape detection module.

[0007] The tooth surface detection module includes an adjustment component and a tooth surface acquisition component. The tooth surface acquisition component includes multiple tooth surface image acquisition units. The tooth surface image acquisition units have the freedom of movement to approach or move away from the tooth surface. The tooth surface image acquisition units also have the freedom of rotation to adjust their image acquisition range to move along the width direction of the tooth surface. The adjustment component is used to drive the tooth surface image acquisition units to move along the freedom of movement and the freedom of rotation.

[0008] The adjustment component includes multiple groups of adjustment units, and the multiple groups of adjustment units correspond one-to-one to the multiple groups of tooth surface image acquisition units. The adjustment unit includes a rotation drive unit and a telescopic drive unit. The telescopic drive unit is arranged on the output end of the rotation drive unit, and the tooth surface image acquisition unit is arranged on the output end of the telescopic drive unit. The rotation drive unit and the telescopic drive unit are both connected to the control module. The control module adjusts the rotation angle of the rotation drive unit and the telescopic length of the telescopic drive unit according to the tooth shape information fed back by the tooth shape detection module.

[0009] The brush head is a triangular prism structure, and the tooth brushing module, the tooth surface detection module and the tooth shape detection module are respectively arranged on the three prism sides of the brush head.

[0010] A side of the brush head where the tooth surface detection module is arranged has a receiving cavity, the tooth surface detection module is arranged in the receiving cavity, and a transparent cover plate is arranged at the opening of the receiving cavity.

[0011] The tooth shape detection module is configured as a plate-shaped structure and is perpendicular to the prism side surface of the brush head. Tooth shape image acquisition units are disposed on opposite sides of the tooth shape detection module.

[0012] The toothbrushing module includes a floating pre-tensioning unit and a bristle unit. The bristle unit and the floating pre-tensioning unit are provided in multiple and one-to-one correspondence. The bristle unit is telescopically arranged on the prism side of the brush head, and the floating pre-tensioning unit is arranged between the bristle unit and the inner side wall of the brush head.

[0013] The oral toothbrush further comprises a display unit, and the tooth surface detection module and the tooth shape detection module are both connected to the display unit.

[0014] The present invention also proposes an application method of a visualized oral toothbrush based on multi-dimensional detection, the application method being applied to the oral toothbrush described in any one of the above-mentioned solutions, and the application method comprising the following steps:

[0015] Acquire the shape of the tooth surface to be tested;

[0016] According to the shape of the tooth surface to be tested, the testing surface adapted to the tooth surface to be tested is adjusted to obtain the defect size on the tooth surface to be tested;

[0017] Obtain the defect depth of the tooth based on the defect size;

[0018] Determine whether the defect depth is greater than a threshold. If so, give treatment suggestions; if not, give maintenance suggestions.

[0019] The working principle and beneficial effects of the present invention are:

[0020] The present invention discloses a visualized oral toothbrush based on multi-dimensional detection. The tooth brushing module on the brush head can be controlled by a control module to clean the tooth surface. Then the control module detects the shape of the tooth surface through a tooth shape detection module on the brush head. The shape of the tooth surface will be fed back to the control module. Then the control module adjusts the tooth surface detection module according to the shape of the tooth surface so that its detection surface matches the tooth surface shape fed back by the tooth shape detection module, that is, the tooth shape information. The tooth surface detection module can obtain defect information on the tooth surface and transmit the defect information to the analysis module. The analysis module integrates the defect information, analyzes the tooth defects, determines the severity of the tooth defects, and provides the user with a guiding detection and analysis reference to meet the needs of the user to perform quick and easy detection of teeth. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] Figure 1 This is a schematic diagram of the connection layout of various modules of the toothbrush in the present invention;

[0023] Figure 2 The isometric structure of the toothbrush of the present invention is shown in FIG. Figure 1 ;

[0024] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0025] Figure 4 The isometric structure of the toothbrush of the present invention is shown in FIG. Figure 2 ;

[0026] Figure 5 for Figure 4 A partial enlarged view of point B in the middle;

[0027] Figure 6 It is a schematic diagram of the top view of the toothbrush of the present invention;

[0028] Figure 7 for Figure 6 Cross-sectional view along CC direction;

[0029] Figure 8 for Figure 7 A partial enlarged view of point E in the middle;

[0030] Fig. 9 for Figure 6 The cross-sectional view along the DD direction;

[0031] Fig.10 for Fig. 9 A partial enlarged view of point F in the middle;

[0032] Fig.11 It is a schematic diagram of the main steps of the application method of the present invention;

[0033] In the figure: 1. brush handle, 2. brush head, 3. brushing module, 4. tooth surface detection module, 5. tooth shape detection module, 6. control module, 7. analysis module, 8. tooth surface image acquisition unit, 9. rotation drive unit, 10. telescopic drive unit, 11. accommodating cavity, 12. transparent cover, 13. floating pre-tightening unit, 14. bristle unit, 15. display unit. DETAILED DESCRIPTION

[0034] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] like Figures 1 to 10 As shown, this embodiment proposes a visualized oral toothbrush based on multi-dimensional detection, wherein the oral toothbrush comprises a brush handle 1 and a brush head 2, wherein the brush head 2 is detachably arranged on the brush handle 1, and the brush head 2 is provided with a toothbrushing module 3, a tooth surface detection module 4 and a tooth shape detection module 5, and the brush handle 1 is provided with a control module 6 and an analysis module 7, wherein the control module 6 selectively controls the operation of the tooth surface detection module 4 and the tooth shape detection module 5, and the analysis module 7 is communicatively connected with the tooth surface detection module 4 and the tooth shape detection module 5, and the control module 6 adjusts the detection surface of the tooth surface detection module 4 according to the tooth shape information fed back by the tooth shape detection module 5 so that it matches the tooth shape information fed back by the tooth shape detection module 5.

[0036] In this embodiment, the oral toothbrush is divided into a brush handle 1 and a brush head 2. The brush head 2 is detachably arranged on the brush handle 1. A control module 6 and an analysis module 7 are installed on the brush handle 1. The control module 6 can be a button-type module or a touch-type module. In addition, the control module 6 is used to control the brushing module 3, the tooth surface detection module 4 and the tooth shape detection module 5 installed on the brush head 2. The control module 6 can selectively control the brushing module 3, the tooth surface detection module 4 and the tooth shape detection module 5 by buttons or contacts, and can also selectively control the operation of each module through its internal control program after startup. The brushing module 3 on the brush head 2 cleans the tooth surface after startup under the control of the control module 6. The brushing module 3 can clean the tooth surface residue, dental plaque and dental calculus. The brushing module 3 can set different cleaning modes according to different cleaning objects. The tooth shape detection module 5 and the tooth surface detection module 4 are both connected to the analysis module 7. The control module 6 controls the tooth shape detection module 5 to collect the tooth shape after cleaning and feed back the tooth shape information to the analysis module 7. The analysis module 7 is connected to the control module 6. After the analysis module 7 feeds back the data to the control module 6, the control module 6 adjusts the detection surface of the tooth surface detection module 4 according to the tooth shape information, so that the detection surface of the tooth surface detection module 4 matches the tooth surface information of the tooth. It should be noted that the surface of the tooth is generally an irregular curved surface. Therefore, if the tooth surface is detected without distinguishing and the tooth surface information is directly collected, the defect information collected on the tooth surface will be inaccurate. The matching of the detection surface of the tooth surface detection module 4 with the tooth surface information can be understood as making the detection direction of the tooth surface detection module 4 within the allowable range and the tooth surface to be detected at a nearly vertical angle. Since the tooth surface detection module 4 needs to feed back the tooth surface information to the analysis module 7, if the information collection is inaccurate, the analysis result will be inaccurate, and it is impossible to provide users with more reliable guidance and suggestions.

[0037] The tooth surface detection module 4 includes an adjustment component and a tooth surface acquisition component. The tooth surface acquisition component includes multiple tooth surface image acquisition units 8. The tooth surface image acquisition unit 8 has the freedom of movement to approach or move away from the tooth surface. The tooth surface image acquisition unit 8 also has the freedom of rotation to adjust its image acquisition range along the width direction of the tooth surface. The adjustment component is used to drive the tooth surface image acquisition unit 8 to move along the freedom of movement and the freedom of rotation.

[0038] In this embodiment, the tooth surface detection module 4 is configured as an adjustment component and a tooth surface acquisition component, wherein the tooth surface acquisition component is a plurality of tooth surface image acquisition units 8, each tooth surface image acquisition unit 8 has a corresponding acquisition surface, and the plurality of acquisition surfaces form a detection surface. The adjustment component can drive the tooth surface image acquisition unit 8 to adjust its position, so that the tooth surface image acquisition unit 8 has the freedom of movement to move close to or away from the tooth surface and the freedom of rotation to adjust its image acquisition range to move along the width direction of the tooth surface. By adjusting along the above degrees of freedom, the acquisition surface of the tooth surface image acquisition unit 8 is adjusted, so that the detection surface of the tooth surface detection module 4 matches the irregular curved tooth surface to be detected, thereby obtaining more accurate tooth surface defect information.

[0039] The adjustment component includes multiple groups of adjustment units, and the multiple groups of adjustment units correspond one-to-one to the multiple groups of tooth surface image acquisition units 8. The adjustment unit includes a rotation drive unit 9 and a telescopic drive unit 10. The telescopic drive unit 10 is arranged on the output end of the rotation drive unit 9, and the tooth surface image acquisition unit 8 is arranged on the output end of the telescopic drive unit 10. The rotation drive unit 9 and the telescopic drive unit 10 are both connected to the control module 6. The control module 6 adjusts the rotation angle of the rotation drive unit 9 and the telescopic length of the telescopic drive unit 10 according to the tooth shape information fed back by the tooth shape detection module 5.

[0040] In this embodiment, the adjustment components are also set to multiple groups, which correspond to multiple groups of tooth surface image acquisition units 8 one by one, and each group of adjustment components adjusts the position and angle of the tooth surface image acquisition unit 8 accordingly. Specifically, the adjustment unit can be set to a rotation drive unit 9 and a telescopic drive unit 10. In a possible embodiment, the tooth surface image acquisition unit 8 is set on the output end of the telescopic drive unit 10, that is, the telescopic end. The telescopic drive unit 10 adjusts the distance between the tooth surface image acquisition unit 8 and the tooth surface to be detected, that is, the tooth surface, and the telescopic drive unit 10 is installed on the output end of the rotation drive unit 9, that is, the rotating end. The rotation of the rotation drive unit 9 can drive the telescopic drive unit 10 to adjust its angle relative to the tooth surface to be detected, and then adjust the angle of the tooth surface image acquisition unit 8 relative to the tooth surface to be detected. In another possible embodiment, the tooth surface image acquisition unit 8 can also be set at the output end of the rotation drive unit 9, and the rotation drive unit 9 is set at the output end of the telescopic drive unit 10, which can achieve the same effect. It should be noted that this embodiment only provides a feasible implementation method of the adjustable angle and position of the tooth surface image acquisition unit 8, and other feasible implementation methods can also be applied. The rotation drive unit 9 and the telescopic drive unit 10 are both miniaturized devices, and can respectively adopt a micro motor or a micro push rod motor. Of course, this is not restrictive, and other drive devices that can achieve the same motion effect can also be adopted.

[0041] The brush head 2 is a triangular prism structure, and the tooth brushing module 3 , the tooth surface detection module 4 and the tooth shape detection module 5 are respectively disposed on the three prism sides of the brush head 2 .

[0042] In this embodiment, the tooth brushing module 3, the tooth surface detection module 4 and the tooth shape detection module 5 are arranged on the brush head 2. The brush head 2 is designed as a triangular prism structure. The sides of the three prisms are respectively provided with the tooth brushing module 3, the tooth surface detection module 4 and the tooth shape detection module 5. Different modules are arranged at different side positions of the prism to improve the recognition of each partition and facilitate use.

[0043] The side of the brush head 2 where the tooth surface detection module 4 is disposed has a receiving cavity 11 , the tooth surface detection module 4 is disposed in the receiving cavity 11 , and a transparent cover plate 12 is disposed at the opening of the receiving cavity 11 .

[0044] In this embodiment, a accommodating cavity 11 is opened on one of the prism sides of the brush head 2, which can be in the form of a groove. The tooth surface detection module 4 is installed in the accommodating cavity 11, and a transparent cover plate 12 is installed at the opening of the accommodating cavity 11. The tooth surface detection module 4 can collect information on the tooth surface to be detected through the transparent cover plate 12.

[0045] The tooth shape detection module 5 is configured as a plate-shaped structure and is perpendicular to the prism side surface of the brush head 2 . Tooth shape image acquisition units are disposed on opposite sides of the tooth shape detection module 5 .

[0046] In this embodiment, a tooth shape detection module 5 is installed on one of the remaining side surfaces of the triangular prism brush head 2. The tooth shape detection module 5 is designed as a plate-type structure. Tooth shape image acquisition units are provided on both sides of the plate-type structure. The plate-type structure and the side surfaces of the prism are perpendicular to each other. When the tooth shape needs to be detected, the tooth shape image acquisition units on the two side surfaces are convenient to use. By adjusting the position of the tooth shape detection module 5 by holding the brush handle 1, the tooth shape information of different positions of the teeth can be detected. The tooth shape information can be but is not limited to the shape of the teeth.

[0047] The toothbrushing module 3 includes a floating pre-tensioning unit 13 and a bristle unit 14. The bristle unit 14 and the floating pre-tensioning unit 13 are each provided in multiple and one-to-one correspondence. The bristle unit 14 is telescopically arranged on the prism side of the brush head 2, and the floating pre-tensioning unit 13 is arranged between the bristle unit 14 and the inner side wall of the brush head 2.

[0048] In this embodiment, the toothbrushing module 3 includes a bristle unit 14 and a floating preload unit 13. The bristle unit 14 is arranged on the side of the prism. The bristle unit 14 can move freely in a direction perpendicular to the side, and the floating preload unit 13 is installed between the bristle unit 14 and the inner wall of the brush head 2. When brushing teeth, the bristle unit 14 is provided with a preload force in the direction of the teeth. The floating preload unit 13 can use a component such as an elastic member to adjust the preload elastic force so that when the bristle unit 14 cleans the teeth, the end of the bristle contacts the tooth surface, thereby improving the cleaning effect. The non-floating bristles may contact the side of the bristles with the tooth surface due to extrusion, thereby reducing the cleaning effect. In addition to the above-mentioned embodiments, the toothbrushing module 3 can also be provided with a module structure for ultrasonic cleaning or sandblasting cleaning, which can be selectively installed to improve the cleaning effect.

[0049] The oral toothbrush further comprises a display unit 15 , and the tooth surface detection module 4 and the tooth shape detection module 5 are both connected to the display unit 15 .

[0050] In this embodiment, a display unit 15 may also be provided, and the tooth surface detection module 4 and the tooth shape detection module 5 are both connected to the display unit 15, wherein the connection method may be a wired connection or a wireless connection, so that the user can observe the corresponding teeth during use and realize visualization.

[0051] An application method of a visualized oral toothbrush based on multi-dimensional detection, the application method being applied to the oral toothbrush described in any one of the above-mentioned schemes, the application method comprising the following steps:

[0052] Acquire the shape of the tooth surface to be tested;

[0053] According to the shape of the tooth surface to be tested, the testing surface adapted to the tooth surface to be tested is adjusted to obtain the defect size on the tooth surface to be tested;

[0054] Obtain the defect depth of the tooth based on the defect size;

[0055] Determine whether the defect depth is greater than a threshold. If so, give treatment suggestions; if not, give maintenance suggestions.

[0056] In this embodiment, see Fig.11, a method for applying a visualized oral toothbrush based on multi-dimensional detection is proposed. The user uses the toothbrush in the above embodiment to clean the teeth with the brushing module 3 by operating the control module 6, and then places the tooth shape detection module 5 against the tooth surface to be detected, so that the tooth shape image acquisition unit on the tooth shape detection module 5 obtains the shape of the tooth surface to be detected, and then adjusts the detection surface of the tooth surface detection module 4 according to the shape of the tooth surface to be detected, so that the detection surface matches the shape of the tooth surface to be detected, that is, matches the tooth shape information. Specifically, the control module 6 adjusts the adjustment component to adjust the distance and angle of each tooth surface image acquisition unit 8 from the tooth surface to be detected, so that the tooth surface image acquisition unit 8 obtains the defect size of the tooth surface to be detected at a vertical angle as much as possible, so that the corresponding size can be obtained more accurately. The built-in data model of the analysis module 7 can infer the defect depth of the tooth according to the above defect size. For example, using YOLO (You Only Look Once) series models are used to segment caries tooth lesion images, which can provide more accurate auxiliary diagnostic tools for clinicians. Of course, this is not restrictive. Other data models can also be used for analysis to determine whether the defect depth is greater than or less than a threshold. It should be noted that the threshold can be adaptively set according to the patient's condition to determine whether the defect has a certain risk of damaging the dental pulp, providing users with reference suggestions for treatment or maintenance more quickly, and providing patients with their own tooth information for reference in planning subsequent dental examinations and treatments.

[0057] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A visual oral toothbrush based on multi-dimensional detection, characterized in that: The oral toothbrush comprises a brush handle (1) and a brush head (2), wherein the brush head (2) is detachably arranged on the brush handle (1), and the brush head (2) is provided with a tooth brushing module (3), a tooth surface detection module (4) and a tooth shape detection module (5), and the brush handle (1) is provided with a control module (6) and an analysis module (7), wherein the control module (6) selectively controls the operation of the tooth surface detection module (4) and the tooth shape detection module (5), and the analysis module (7) is communicatively connected with the tooth surface detection module (4) and the tooth shape detection module (5), and the control module (6) adjusts the detection surface of the tooth surface detection module (4) according to the tooth shape information fed back by the tooth shape detection module (5) so as to make it match the tooth shape information fed back by the tooth shape detection module (5).

2. The visual oral toothbrush based on multi-dimensional detection according to claim 1, characterized in that: The tooth surface detection module (4) comprises an adjustment component and a tooth surface acquisition component, the tooth surface acquisition component comprises a plurality of tooth surface image acquisition units (8), the tooth surface image acquisition units (8) have a degree of freedom of movement to approach or move away from the tooth surface, the tooth surface image acquisition units (8) also have a degree of freedom of rotation to adjust their image acquisition range to move along the width direction of the tooth surface, and the adjustment component is used to drive the tooth surface image acquisition units (8) to move along the degree of freedom of movement and the degree of freedom of rotation.

3. The visual oral toothbrush based on multi-dimensional detection according to claim 2, characterized in that: The adjustment component comprises a plurality of groups of adjustment units, the plurality of groups of adjustment units corresponding to the plurality of groups of tooth surface image acquisition units (8) on a one-to-one basis, the adjustment units comprising a rotation drive unit (9) and a telescopic drive unit (10), the telescopic drive unit (10) being arranged on the output end of the rotation drive unit (9), the tooth surface image acquisition unit (8) being arranged on the output end of the telescopic drive unit (10), the rotation drive unit (9) and the telescopic drive unit (10) being both connected to the control module (6), and the control module (6) adjusting the rotation angle of the rotation drive unit (9) and the telescopic length of the telescopic drive unit (10) according to the tooth shape information fed back by the tooth shape detection module (5).

4. The visual oral toothbrush based on multi-dimensional detection according to claim 3, characterized in that: The brush head (2) is a triangular prism structure, and the tooth brushing module (3), the tooth surface detection module (4) and the tooth shape detection module (5) are respectively arranged on the three prism sides of the brush head (2).

5. The visual oral toothbrush based on multi-dimensional detection according to claim 4, characterized in that: The side of the brush head (2) on which the tooth surface detection module (4) is arranged has a receiving cavity (11), the tooth surface detection module (4) is arranged in the receiving cavity (11), and a transparent cover plate (12) is arranged at the opening of the receiving cavity (11).

6. The visual oral toothbrush based on multi-dimensional detection according to claim 1, characterized in that: The tooth shape detection module (5) is configured as a plate-shaped structure and is perpendicular to the prism side surface of the brush head (2); tooth shape image acquisition units are provided on opposite sides of the tooth shape detection module (5).

7. The visual oral toothbrush based on multi-dimensional detection according to claim 1, characterized in that: The toothbrushing module (3) comprises a floating pre-tensioning unit (13) and a bristle unit (14), wherein the bristle unit (14) and the floating pre-tensioning unit (13) are both provided in plurality and correspond one to one, wherein the bristle unit (14) is telescopically provided on the prism side surface of the brush head (2), and the floating pre-tensioning unit (13) is provided between the bristle unit (14) and the inner side wall of the brush head (2).

8. The visual oral toothbrush based on multi-dimensional detection according to claim 1, characterized in that: The oral toothbrush further comprises a display unit (15), and the tooth surface detection module (4) and the tooth shape detection module (5) are both connected to the display unit (15).

9. An application method of a visualized oral toothbrush based on multi-dimensional detection, characterized in that: The application method is applied to the oral toothbrush according to any one of claims 1 to 8, and the application method comprises the following steps: Acquire the shape of the tooth surface to be tested; According to the shape of the tooth surface to be tested, the testing surface adapted to the tooth surface to be tested is adjusted to obtain the defect size on the tooth surface to be tested; Obtain the defect depth of the tooth based on the defect size; Determine whether the defect depth is greater than a threshold. If so, give treatment suggestions; if not, give maintenance suggestions.

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